Precision Granite Surface Plate Table 18 x 18 x 3 Grade A or B

There is a reason you find Cheap Surface Plates on the internet and this is not one of them. Precision Granite Surface Plates are a must-have for precise part measurement, part inspection and calibration. Our 18x18x3 inch high-quality black precision granite surface plates are MADE IN THE USA and provide the strongest, most durable and stable surfaces available.
All of the precision granite surface plates we provide are manufactured to meet or exceed tolerances specified by Federal Specification GGG-P-463c in compliance with ANSI/NCSL Z540-1 and ISO 10012 in accordance with ISO 9001 certified quality systems, traceable to N.I.S.T.  
A Calibration Certificate for precision granite surface plate is included with every unit when purchased.

Selecting a Grade:
When ordering, select Inspection Grade A, or Toolroom Grade B.

Surface Plate Ledges (Optional):
Product pricing below does not have ledges. Surface Plates without ledges (0-Ledge ) are the most commonly used and purchased 99 percent of the time for most manufacturing facilities. Ledges are for work clamping purposes only.  For 2 or 4 Ledge Surface Plates, contact us for pricing and availability.

Steel Support Stand (sold separately): See Granite Surface Plate Support Stands
Precision granite surface plates should never be placed on table-tops!
A steel support stand is required to use any granite surface plate. Three-point fixed suspension stands are recommended to minimize sag and warp, thus maximizing accuracy long term. Align the markings on the bottom of the granite plate with the supports on the stand.

Vinyl Covers (sold separately): See Granite Surface Plate Vinyl Covers
Purchase a Vinyl Cover to maintain accuracy and prevent wear due to abrasion of sliding parts on unclean surfaces.